The Panther II was a tank that never really came to fruition because of the simple upgrading of the already in-service Panther tanks being retrofitted with several features and up-armored on the sides of the tank especially.
The upgraded design by Dr. Wiebecke called for an upgrade of the frontal glacis plate to 100 mm (3.9 in), the side armor to 60 mm (2.4 in), and the top armor to 30 mm (1.2 in). This, with e addition of the Tiger I's Final Drive, suspension, and steering gears along with a whole new redesigned turret would increase the total weight to more than 50 metric tons.
The Tiger II's 88mm L/71 cannon was one gun considered, (thus creating the Panther Ausf. F mit 8.8cm) A number of prototype turrets had been produced and tested by different manufacturers in slightly different shapes on and off the existing Panther Ausf. F and G, hulls.